Iiial s



(No Model.)

H. S. GRANNIS. ADJUSTABLE BOX FOR STOVE PIPE FORMERS.

No. 402,583. Patented May 7, 1889;

UNITED STAT S P TENT omcs.

HIAL S. GRANNIS, OF SOUTIIINGTON, CONNECTICUT, ASSIGNOR TO THE PECK, STOW dz WVILCOX COMPANY, OF SAME PLACE.

ADJUSTABLE BOX FOR STOVE-PIPE FORMERS.

, SPECIFICATION formingpart of Letters Patent No. 402,583, dated May 7, 1889.

Application filed February 6, 1889. Serial No. 298,895. (No model.)

To all whom it may concern.-

Be it known that I, IIIAL S. GRANNIS, a citizen of the United States, residing at Southington, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Adjustable Boxes for Stove-Pipe Formers, of which the following is a specification.

My invention relates to improvements in adjustable boxes for stove-pipe formers which are raised and lowered by means of liftingscrews; and the chief object of my invention is a simple construction of the should er of the lifting-screw and its recess in the box, whereby greater freedom is given fora rocking motion of the boxes.

In the accompanying drawings, Figure 1 is a rear elevation of one end of a stove-pipe former provided with my lifting-screws and boxes. Fig. 2 is a side elevation of the frame and boxes for the same end of a former. Fig. 3 is a perspective view of one of the adjustable boxes. Fig. 4 is a vertical section of one of said boxes, together with a side elevation of the lower end of a lifting-screw, showing a slight modification; and Fig. 5 is a side elevation of the same.

A designates one end of the frame, and B B B the respective former-rollers, having their bearings in said frame. The lower roll is mounted in stationary bearings, as at 6, Fig. 2, while the other rollers are mounted at each end in adjustable boxes 7, which are raised and lowered by the thumb-screws 8, all as in the ordinary former, with the exception of the connections of said screws and boxes. The upper por -ion of each box has a transverse recess, 9, extending wholly or partially through the box, and immediately above said recess and opening into it is a slot, 10, which isnarrower than the transverse recess.

In .Figs. 1, 2, and 3 I have shown the transverse recess of a circular form, so that it may be drilled, if desired, by any ordinary drill, after which the slot 10 may be cut out. It may, however, be formed by casting, and it may extend either wholly or partially through the box, provided it extends transversely into the box to the position that the lower end of the lifting-screw will occupy when the parts are in working position.

At the lower end of the screw 8, I form a knob or ball, 11, and immediately above said knob a narrow neck, 12, whereby the top of the knob serves as shoulders on opposite sides of said neck. This knob and neck are fitted to the transverse recess and slot in the box, and they may be formed in the ordinary turning-lathe. The transverse recess and slot open upon that side of the box that is farthest from the ledges 13, which bear upon the inside of the frame, to limit the movement of the boxes and rollers in a longitudinal direction.

In assembling the parts it is only necessary to first insert the lifting-screws until the knob and end projects into the position for the boxes, and then slip the boxes transversely into place, the knob and neck on the end of the screw passing into the recess and slot when the boxes are thus slipped into position. Thus it will be seen that the construction is very simple, requiring no special fitting, and that the boxes and lifting-screws are assembled in a convenient and inexpensive manner. When the two ends of the frame are secured together by the rod C and the rollers, the boxes cannot work out of their places in the fram e,and consequently the connection of the screws and boxes is as permanent as if they were pinned in place. The shoulders formed at the junction of the neck and knob of the screws, bearing upon the upper part of the transverse recesses, enable the screws to lift said boxes and rollers by turning the lifting-screws in one direction and let said rollers and boxes down by turning said screws in the reverse direction, substantially as the rollers are lifted and let down in the ordinary stove-pipe former. By making the top or shoulder of the knob rounded or in the form of a section of a ball or sphere, in connection with the recess in the boxes, I form practically a universal joint, whereby the boxes may rock a little upon the liftingscrews in a direction to tip the axis of the rollers, and there is always great freedom for the box and screw, so that there is less liability of said screws cramping or binding in place than there is in the ordinary construction.

The spherical form of knob at the end of the screw and the round transverse recess shown in Figs. 1, 2, and 3 are specially adapted for a recess that is drilled out, or one that is east and afterward reamed out, in which case a round form is preferred; but when the recess is to be castother forms of knobs and recesses may be employed, provided the shoulder or upper part of the knob is rounded, one of which other forms is illustrated in Figs. 4 and 5, in which the shoulder is in the form of a section of a ball or sphere.

I am aware that prior patents show boxes in analogous machines provided with a transverse recess made flat on the upper side and a narrow slot opening into said recess and lifting-screws fitted thereto provided with a narrow neck and enlarged end, with a flat or square shoulder at the junction of said neck and enlarged end, and the same is hereby disclaimed.

I claim as my invention-- 1. In a stove-pipe former-having adjustable boxes raised and lowered by screws, the combination of lifting-screws 8, provided with a narrow neck and knob, the shoulder or upper part of which is rounded off, substantially as described, and the boxes 7, provided with a transverse recess and narrow slot, the overhanging walls of which are fitted to the upper rounded shoulder of the knobs of said screws, substantially as described, and for the purpose specified.

2. In a stove-pipe former having ad justablc boxes raised and lowered by screws, the combination of the lifting-screws 8, provided with a narrow neck and spherical knob, 11, and the boxes 7, provided with transverse recesses of a cylindrical form and a narrow slot opening into said recesses, substantially as described, and for the purpose specified.

I-IIAL S. GRANNIS.

\Vitnesses:

ELBEnr O. MOORE, AUcUs'rINE M. LEWIS. 

